I'm not sure about the specific products, since you've not provided very precise references. (Also, morco.uk is an invalid domain name.) If you can paste a URL (or URLs) to the precise product(s) you plan to buy, somebody can probably provide a better response.
That said, for C-41, you do need those three items -- developer, bleach, and fixer. (Some third parties substitute a blix for the bleach and fixer, but Kodak uses separate items.) You should also probably get some stabilizer or final rinse. (Most new films can use either, but some older films need a stabilizer for best keeping qualities.)
Most C-41 products, including Kodak's, come as liquids, so it is possible to mix up smaller quantities (250ml, 300ml, 500ml, or whatever) and keep the rest in the bottles.